Malicious PDF — malware analysis report

Static analysis result for SHA-256 27bfafc55e2b7c40…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 07:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dcef2615b2c91e0c13ba6f797dc233ef SHA-1: 87766eca6747f57c28e8f4bb7655702870f59890 SHA-256: 27bfafc55e2b7c4085c23c683eb274f016a6ed2a945409e152d0f092af3220ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan PDF. It contains numerous links, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of callback phishing lures further supports a malicious intent, likely to deceive users into downloading further malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://studiomarazzi.eu/userfiles/files/zimegimomef.pdf In PDF document text
    • http://tomekorea.com/userData/board/file/somoduresanino.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/11063297888.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/zanepeba.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210708_6D7A52E88083D45C.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/14850289715.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/f667c5dd21e1753ef5ee0bf3cc64aea3/35373679890.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/22359678000.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/samodojusulilizilije.pdfIn PDF document text
    • http://richfield1962.com/clients/4/47/47516dc9824f3897220912ef171c404f/File/53790552647.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/naxuxatebutonuv.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/83048599274.pdfIn PDF document text
    • http://klpa.net/userData/board/file/rixafutesujobo.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072d1a8e4849---83940493259.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/wezowozosufujo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac80f8bd9d7---vizaxikusopolopemakaziz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f530e37a5---vakenegob.pdfIn PDF document text
    • http://briarcliff70.com/clients/874901/File/94062699556.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/dekajujodudizowi.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/sofufanolu.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612c05141e6c0---93904534467.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609caf305f942---dawokut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=chinese+learner+english+corpusPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10688 bytes
SHA-256: 3bea07ad16c011b2fbb7ab0dccbc4e49ca76936d7d713fa26378a558fc3a412e
font_01_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 19364 bytes
SHA-256: a10bad7874db850ef6518d0300d21cd08173dcf00d1ae80d90b8088559eab112
font_02_sfnt_off000122c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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